Exclusive: Rumsfeld Inside the Iraq War and More with Diane Sawyer Tonight

Donald Rumsfeld – now 78, a lifelong political insider with a history of serving under Republican presidents from Richard Nixon to George W. Bush, including a stint as President Gerald Ford’s chief of staff as well as President George W. Bush’s Secretary of Defense, breaks his four year silence with Diane Sawyer on tonight’s “Nightline” and then again tomorrow on “World News with Diane Sawyer.”

Rumsfeld acknowledges that he erred in a March 2003 interview with ABC’s George Stephanopoulos, when he said that despite the failure to find weapons of mass destruction shortly after the invasion of Iraq, “we know where they are.”: “My goodness, the intelligence was certainly wrong,” he told Sawyer.

He wouldn’t entertain questions about whether he would have acted differently had he known the truth about the lack of WMDs in Iraq.”I have no idea. I have no idea,” he said. “What you know today can help you on things you’re thinking about tomorrow. It can’t help you with things you were thinking about back then. Back then there was reasonable confidence that he had these weapons.”